<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .one {
            width: 300px;
            height: 300px;
            background-color: red;
            padding-top: 50px;
            box-sizing: border-box;
        }
        .two {
            width: 100px;
            height: 100px;
            background-color: blue;
            /* margin-top: 50px; */
        }
    </style>
</head>
<body>
    <div class="one">
        <div class="two">two</div>
    </div>
    
</body>
</html>